Process for working metals.



P-ATENTED MAR.10, 1908.

s. ZIBTARSKI. PROCESS FOR WORKING METALS.

APPLICATION FILED FEB. 26, 1906.

Y"! NORRIS PETERS :o., wnsmlya'rou. cm:v

PATENT OFFICE.

STANISLAS ZIETARSKI, OF NEWARK, NEW JERSEY.

PROCESS FOR WORKING METALS.

Specification of Letters Patent.

Patented March 10, 1908.

Application filed February 26, 1906. Serial No. 302,955.

T 0 all whom it may concern:

Be it known that I, STANISLAS ZrETARsKI, a citizen of the United States,and a resident of Newark, in the county of Essex and State of NewJersey, United States of America, have invented certain new and usefulImprovements in Processes for Working Metal, of which the following is aspecification.

My invention relates to a new and useful process of working metals, andits object is to overcome some of the difliculties of processes now inuse and to provide a simple and efficient process of manufacturingcertain articles of copper or of any other metal which is capable ofbeing rolled.

I will describe my invention in the following specification and pointout its novel features in a claim.

Referring to'the drawings, Figure 1 is a front elevation and Fig. 2 is aside elevation of a machine for carrying out my .invention, showing apiece of metal being rolled and shaped thereby.

In these drawings, 10 designates a frame which supports a movablecross-head 11. A roller 12 is supported in stationary bearings on theframe 10, and another roller 13 is supported in the cross-head 11directly above roller 12.

1 1, 14 designate guiding members mounted upon the movable cross-head 11by means of which a piece of metal 15 being rolled out between rollers12 and 13 may be pushed down into the required form at the same time itis being acted upon by the rollers. My process is particularlyapplicable to such metals as are sufficiently ductile to be ca pable ofbeing rolled, and in manufacturing large kettles out of copper.

The metal is first cast into the form of a disk 15 of any desired shapeor size; for example, it may be cast or otherwise formed into a flatcircular plate having considerable thickness and of substantially theweight which the finished article of manufacture is to have. This diskis then placed between two rollers 12 and 13 of comparatively shortlength with properly shaped rolling surfaces. These rollers may bedriven by any desired power and are arranged to be driven simultaneouslyand so that they may be driven. together with considerable force. Thedisk or plate is so placed between these rollers that the latter willbear near its central point. The rollers are then brought together sothat ished article'of manufacture is to have.

is especially useful l they compress the disk near its central point andthe latter is caused to move by the motion of the rollers. The movementof the disk is then guided by hand or by any suitable mechanism so thatit has a circular movement, or rather a spiral movement. The rollers maynow be brought toward each other so that their distance apart is equalto the desired thickness of the finished article of manufacture, and, asthe disk is moved between these rollers, it will become flattened to thedesired thickness thereby. As the disk is thus moved spirally by therollers, its outer edge may be guided up or down, as may be desired, sothat as the metal becomes rolled down to the desired thickness, it will,at the same time, assume the form which the fin- This operation isfacilitated by the fact that the portion of the disk which is thusreduced in thickness by the action of the rollers, necessarily becomesgreater in area while the other parts of the disk remain unchanged. 1

This process has been found very useful in rolling kettles of variousshapes and is a great improvement over former methods in use for thispurpose. The movement of the metal between the rollers is continuous, anthe metal is easily guided into shape while it is thus being rolled.This, of course, is obviously a great saving in time and trouble overthe former method ,of rolling articles of manufacture of this nature bya reciprocating movement or by forming them by hammering. In fact, ithas been found that metals or alloys, which are not capable of beingformed by the hammering process, may be successfully made by thisprocess. The continuous rolling of the metal between rollers underpressure has a tendency to solidify the metal itself.

The rollers may be of any desired shape, and in fact, different sha edrollers are used for different shaped artic es of manufacture, and insome cases, different shaped rollers are used for forming differentparts of the same article of manufacture.

While I have described this invention as used in the manufacture ofcopper kettles I do not mean to limit myself to this specific use as myprocess may be used with other kinds of metals and forforming otherkinds of articles of manufacture. It is particularly adaptable forforming circular kettles, but it may be also used to manufacturearticles of other forms, as, 'for example, elliptical dishes I ed rolls,said or vessels.

What I claim is:

1. The herein described method of working metals which consists inreducing the thickness of and shaping a metal blank by rolling pressureapplied first to the ortion which is within the periphery, reduclng thethickness of said inner portion and thereby enlarging its area morerapidly than the portions toward the periphery, at the same timepermitting the blank to dish or buckle.

2. The herein described method of working metals which consists inreducing the thickness of a metal blank by submitting it to pressurebetween two horizontally mountpressure being first applied. to a portionof the blank which is within its periphery reducing the thickness ofsaid inner portion and thereby enlarging its area more rapidly than theportions toward the periphery permitting the blank to dish or buckle,and at the same time guiding the dished blank vertically into therequired form.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses. V

STAN ISLAS 'ZIETARSKI.

Witnesses:

JosEPH E. \OAVANAUG'H, ELLA TUOH.

